Full Disclosure: Windows Vista/7 : SMB2.0 NEGOTIATE PROTOCOL REQUEST Remote B.S.O.D
laurent gaffie has produced a proof of concept remote BSOD affecting windows vista /7.
It is advised at this time to block all NETBIOS and SMB trafic on your network as there is currently no patch available.
Read the entry here: http://seclists.org/fulldisclosure/2009/Sep/0039.html
At the time of writing this entry I tested this on a Windows Vista VM (fully patched).